File: /usr/src/linux/fs/jffs/intrep.h
1 /*
2 * JFFS -- Journaling Flash File System, Linux implementation.
3 *
4 * Copyright (C) 1999, 2000 Axis Communications AB.
5 *
6 * Created by Finn Hakansson <finn@axis.com>.
7 *
8 * This is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * $Id: intrep.h,v 1.11 2000/08/17 22:46:46 bmatthews Exp $
14 *
15 */
16
17 #ifndef __LINUX_JFFS_INTREP_H__
18 #define __LINUX_JFFS_INTREP_H__
19 #include "jffs_fm.h"
20 __u32 jffs_checksum(const void *data, int size);
21
22 void jffs_cleanup_control(struct jffs_control *c);
23 int jffs_build_fs(struct super_block *sb);
24
25 int jffs_insert_node(struct jffs_control *c, struct jffs_file *f,
26 const struct jffs_raw_inode *raw_inode,
27 const char *name, struct jffs_node *node);
28 struct jffs_file *jffs_find_file(struct jffs_control *c, __u32 ino);
29 struct jffs_file *jffs_find_child(struct jffs_file *dir, const char *name, int len);
30
31 void jffs_free_node(struct jffs_node *node);
32
33 int jffs_foreach_file(struct jffs_control *c, int (*func)(struct jffs_file *));
34 int jffs_free_node_list(struct jffs_file *f);
35 int jffs_free_file(struct jffs_file *f);
36 int jffs_possibly_delete_file(struct jffs_file *f);
37 int jffs_build_file(struct jffs_file *f);
38 int jffs_insert_file_into_hash(struct jffs_file *f);
39 int jffs_insert_file_into_tree(struct jffs_file *f);
40 int jffs_unlink_file_from_hash(struct jffs_file *f);
41 int jffs_unlink_file_from_tree(struct jffs_file *f);
42 int jffs_remove_redundant_nodes(struct jffs_file *f);
43 int jffs_file_count(struct jffs_file *f);
44
45 int jffs_write_node(struct jffs_control *c, struct jffs_node *node,
46 struct jffs_raw_inode *raw_inode,
47 const char *name, const unsigned char *buf,
48 int recoverable, struct jffs_file *f);
49 int jffs_read_data(struct jffs_file *f, unsigned char *buf, __u32 read_offset, __u32 size);
50
51 /* Garbage collection stuff. */
52 int jffs_garbage_collect_thread(void *c);
53 void jffs_garbage_collect_trigger(struct jffs_control *c);
54 int jffs_garbage_collect_now(struct jffs_control *c);
55
56 /* Is there enough space on the flash? */
57 static inline int JFFS_ENOUGH_SPACE(struct jffs_control *c, __u32 space)
58 {
59 struct jffs_fmcontrol *fmc = c->fmc;
60
61 while (1) {
62 if ((fmc->flash_size - (fmc->used_size + fmc->dirty_size))
63 >= fmc->min_free_size + space) {
64 return 1;
65 }
66 if (fmc->dirty_size < fmc->sector_size)
67 return 0;
68
69 if (jffs_garbage_collect_now(c)) {
70 D1(printk("JFFS_ENOUGH_SPACE: jffs_garbage_collect_now() failed.\n"));
71 return 0;
72 }
73 }
74 }
75
76 /* For debugging purposes. */
77 void jffs_print_node(struct jffs_node *n);
78 void jffs_print_raw_inode(struct jffs_raw_inode *raw_inode);
79 int jffs_print_file(struct jffs_file *f);
80 void jffs_print_hash_table(struct jffs_control *c);
81 void jffs_print_tree(struct jffs_file *first_file, int indent);
82
83 struct buffer_head *jffs_get_write_buffer(kdev_t dev, int block);
84 void jffs_put_write_buffer(struct buffer_head *bh);
85
86 #endif /* __LINUX_JFFS_INTREP_H__ */
87